| Citation: | LI Peiyue，HE Qiang，WU Jianhua，et al. Effects of inorganic salts on pore structure and permeability of undisturbed loess under dry-wet cycles[J]. Bulletin of Geological Science and Technology，2026，45（3）：1-10 doi: 10.19509/j.cnki.dzkq.tb20240711
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The infiltration of inorganic salt solutions during dry-wet cycles significantly affects the structural strength and stability of undisturbed loess. This study aims to investigate the impact of inorganic salts on the pore structure and permeability of undisturbed loess under dry-wet cycles.
To achieve this objective, loess samples were collected from the South Plateau in Jingyang County, Shaanxi Province. Through laboratory experiments, this study systematically analyzed the variations in permeability and pore structure of undisturbed loess under different dry-wet cycle conditions and different concentrations of sodium chloride solution, as well as the associated soil-water interaction mechanisms.
The results indicated that dry-wet cycles reduced the permeability of undisturbed loess, and the saturated permeability coefficient of undisturbed loess decreased with the increase in the number of dry-wet cycles. The sodium chloride solution increased the permeability of undisturbed loess, and this effect became more pronounced with increasing solution concentration. Dry-wet cycles promoted the development of fissures on the surface of undisturbed loess and increased the number and area ratio of micropores, thereby reducing effective porosity of the soil mass and resulting in a more compact soil structure. The infiltration of sodium chloride solution promoted the dissolution of minerals such as gypsum and halite, leading to enhanced pore development and increased permeability.
This study improves the understanding of changes in loess structure and permeability under the combined effects of dry-wet cycles and inorganic salt solution infiltration, providing scientific support for soil and water conservation and engineering construction in loess regions.
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